Control of color and efficiency of light-emitting diodes based on polyfluorenes blended with hole-transporting molecules

被引：189

作者：

Sainova, D

Miteva, T

Nothofer, HG

Scherf, U

Glowacki, I

Ulanski, J

Fujikawa, H

Neher, D ^{[1
]}

机构：

[1] Univ Potsdam, Inst Phys, D-14469 Potsdam, Germany

[2] Max Planck Inst Polymer Res, D-55021 Mainz, Germany

[3] Lodz Tech Univ, Fac Chem, Dept Mol Phys, PL-90924 Lodz, Poland

[4] Toyota Cent Res & Dev Labs Inc, Aichi 4801192, Japan

来源：

APPLIED PHYSICS LETTERS | 2000年 / 76卷 / 14期

关键词：

D O I：

10.1063/1.126173

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Adding low-molecular-weight hole-transporting molecules (HTM) with different oxidation potentials to the polyfluorene emission layer of single-layer light-emitting diodes causes significant changes in the device properties. The pronounced increase in luminance efficiency combined with a decrease in current is attributed to significant hole trapping, as further suggested by thermoluminescence experiments. Using a oligo-triphenylamine HTM with an ionization potential of similar to 4.9 eV, light-emitting diodes with stable blue emission, a brightness of 800 cd/m(2) and an efficiency of 0.87 cd/A were realized. Further, the red-emitting contribution to the spectra as observed in the pure polymer devices could be fully suppressed. (C) 2000 American Institute of Physics. [S0003-6951(00)05214-1].

引用

页码：1810 / 1812

页数：3

共 29 条

[1] Effect of majority carrier space charges on minority carrier injection in dye doped polymer light-emitting devices [J].